论文标题
$ -MN的压力温度相图
Pressure-Temperature Phase Diagram of $α$-Mn
论文作者
论文摘要
在高压下，在高质量的单晶$α$ -MN下进行了电阻率和AC敏感性测量。 The pressure-temperature phase diagram consists of an antiferromagnetic ordered phase (0<$P$<1.4 GPa, $T<T_{\rm N}$), a pressure-induced ordered phase (1.4<$P$<4.2-4.4 GPa, $T<T_{\rm A}$), and a paramagnetic phase.在$ t _ {\ rm a} $下的AC敏感性的温度依赖性中观察到了显着提高，这表明压力诱导的有序相具有自发的磁矩。提出铁磁性和寄生铁磁磁性作为可能的磁性结构的候选者。在压力诱导的有序相消失的临界压力下，低于10 K的电阻率的温度依赖性与$ t^{5/3} $成正比。这种非Fermi液体行为表明存在明显的磁波动。
Electrical resistivity and ac-susceptibility measurements under high pressure were carried out in high-quality single crystals of $α$-Mn. The pressure-temperature phase diagram consists of an antiferromagnetic ordered phase (0<$P$<1.4 GPa, $T<T_{\rm N}$), a pressure-induced ordered phase (1.4<$P$<4.2-4.4 GPa, $T<T_{\rm A}$), and a paramagnetic phase. A significant increase was observed in the temperature dependence of ac-susceptibility at $T_{\rm A}$, indicating that the pressure-induced ordered phase has a spontaneous magnetic moment. Ferrimagnetic order and parasitic ferromagnetism are proposed as candidates for a possible magnetic structure. At the critical pressure, where the pressure-induced ordered phase disappears, the temperature dependence of the resistivity below 10 K is proportional to $T^{5/3}$. This non-Fermi liquid behavior suggests the presence of pronounced magnetic fluctuation.
